span {
    background-color: red;
}

h1 {
    color: blue;
}

* {
    font-family:Arial, Helvetica, sans-serif;
    margin: 0px;
    padding: 0px;
}

header {
    top:0;
}

.navigationbar{
    display:flex;
    width:100%;
    font-size: 20px;
    color:#FFFFFF;
    background-color:#c50000;
    height:50px;
    justify-content: space-around;
}

.header {
    display:flex;
    flex-direction: column;
}

.navigationbarList {
    display: flex;
    flex-direction: row;
}

.navigationbar > img {
    display:none;
}

.main-page-content {
    display:flex;
    justify-content: center;
}

.main-page-content-canvas {
    display:flex;
    align-items: center;
    flex-direction: column;
    justify-content: center;
    
}

.javascript-applet-controls {
    display:flex;
    flex-direction: column;
}

.main-page-content-canvas > main {
    flex-direction: row;
}

.main-page-content > main {
    display:flex;
    width:500px;
    margin:2em;
    justify-content: center;
    align-content: center;
    border: solid 2px #000000;
}

canvas {
    border: solid 2px #000000;
}

img {
    float: right;
    margin:5px;
}

@media screen and (width < 500px) {
    .main-page-content {
        flex-direction: column;
    }

    .main-page-content > main {
        margin:0em;
    }

    .header {
        flex-direction: row;
    }

    .navigationbar {
        height: 100%;
        flex-direction: column;
        justify-content:flex-start;
    }

    .navigationbar > ul {
        height: fit-content;
        flex-direction: column;
    }

    .navigationbar > img {
        display:flex;
        height: 64px;
        width: 64px;
    }

    .hideOrShow {
        display:none;
    }

    canvas {
        width: 100vw;
    }
}

.navigationbarList > li {
    list-style:none;
    margin-left: 20px;
    margin-top: 10px;
    
}
.navigationbarList > li > a {
    text-decoration: none;
}
.navigationbarList > li > a:visited {
    color:#FFFFFF;
}
.navigationbarList > li > a:hover {
    color:#FF0000;
    background-color: #FFFFFF;
}

p {

}

body {
    position: relative;
}

footer {
    background-color: #c50000;
    display: flex;
    position: absolute;
    bottom: 0;
    width: 100%;
}

aside {
    display:inline-block;
    list-style: none;
    width: 200px;
}

li {
    list-style: none;
}